Question about 2001 Ford F350 Super Duty SuperCab

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When I turn the heater on defrost the windows all fog up. 2002 Ford F350SD (diesel)

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  • brad_bowen Sep 11, 2009

    Thanks, I will check both.

  • Richard Scordino May 11, 2010

    Check the a/c drain on the firewall to make sure it's unobstructed, check your coolant level...If it's low, your heater core may be leaking.

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  • 194 Answers

Is your aircon working okay? The aircon should kick in to dry the air, with the heater in defrost mode. Hope this helps..

Posted on Sep 11, 2009

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2 Answers

My 2002 explorer windows keep fogging up inside and does not go away when turn on defrost & my engine light is on like my heater core may be bad but I dont smell antifreeze what else could cause t


If it was me, the first thing I'd do is go check my fluid level in my radiator. I'd add fresh anti-freeze, if I hadn't done so in a year or more. Your defrosters won't work properly if you are too low on fluids in your radiator, OR your thermostat is malfunctioning. Replacing your thermostat might be a good job for a mechanic. Good luck.

Nov 28, 2013 | 2002 Ford Explorer

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Why do my windows fog inside on 2002 ford taurus


If your climate control is on recirculate, eventually the window will fog on any vehicle. I recommend placing the HVAC system on fresh air and run the ac if possible. If you want a more in depth answer, see my article and video on fogged car windows. Let me know if that helps Savic.

Mar 05, 2013 | 2002 Ford Taurus

1 Answer

When I turn my heater and defroster on, a bad smell starts and the windows fog up but the air is hot.


This may be due to a bad heater core or dirty core with a plugged water drain, first see if the a/c works. turn it on and see if the air gets cold and if the ac compressor works.

The way the defrost works to keep windows from fogging up is that when the front defroster is tuned on the ac should also be on, on most cars when you go to defrost it will turn ac on automatic. the system then uses hot and cold air to remove the moisture in the air to avoid window fogging. if your a/c is not working then that may cause window to fog, but if you are also getting a smell then the drain that lets out condensation may be plugged and then water builds up and also mold from always being wet and when heat is on you smell that.


i want you to run the defrost and when windows fog up wipe window with hand and see if it is greasy . if it feels oily then you may have a bad heater core, the core leaks coolant out and steam and causing windows to fog up with a flim of grease.

Feb 03, 2013 | 2000 Chevrolet Silverado

1 Answer

While driving my 95 explorer i noticed the heater wasnt getting hot its luke warm and when i turn on the defroster i start to smell anti freeze and all of the windows fog up


no heat is probably low coolant or bad thermostat,although you have fog and smell ! the heating and cooling systems are closed systems the only way the windows fog is the coolant is hot and steams inside the car due to some leak inside the heater core box. as well as the smell being present. Now it is possible that a little leak has occured where the coolant supply or return line connects to the heater core and is running into the car which is running onto the core and creating steam and smell. hopefully it is a easy clamp tighten fix for you.

Jan 13, 2011 | 1995 Ford Explorer

1 Answer

Why my window is fogging whe i turn the heater ?? i recently bought my toyota carina 3 model 1994 but the window is fogging , what should i do?


Make sure the vent system is set to draw air from outside. If it is set to recirculate the same air that's inside the vehicle without drawing fresh air from outside, the resulting humidity that builds up inside the vehicle can fog the windows even when you run the defrost. You can also try opening the windows a bit to get some more air moving inside.
If it still fogs when the vents are set properly, you may have a leaky heater core. The heater core is a small radiator that is located under the dash that the heater system blows air through to heat the inside of your car and provide heat to defrost the windshield. The fog may be coming from the heater core leaking hot coolant steam that's being circulated through the defrost system. If this is so, you will need to replace the heater core.

Jan 07, 2011 | 1997 Toyota Corolla

1 Answer

Should the AC compressor clutch engage when the


yes. the ac removes moisture from the cabin of your car. if it is not engaging that is why your windows are fogging up. you need to have the ac pressure checked. you may just need a recharge.

Jan 02, 2010 | 2002 Ford Taurus

3 Answers

Windows fog up on the inside when defroster is turned on


leaking heater core. The coolant level may be low also. What it is doing is fogging up the window with the steam coming from the hot engine coolant that runs through your dash board when the heater or defrost is on. This should be under some kind of warranty on an '08.

Dec 05, 2009 | 2008 Hyundai Sonata

1 Answer

Truck heater / defrost not working


Sounds like you need to replace your heater core.

Nov 10, 2009 | 2002 Ford F250 Super Duty SuperCab

1 Answer

Front window defroster note working


Was there a smell along with it fogging up the window like antifreeze? If it did the heater core is leaking and needs to be replaced. It will be kind of a sweet smell.

Feb 12, 2009 | 1999 Ford Contour

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